Cruise inventory

RRS Challenger CH76

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH76
Cruise period1991-03-06 — 1991-04-02
Port of departureTroon, United Kingdom
Port of returnBarry, United Kingdom
ObjectivesThe aims of the cruise were to investigate the biogeochemistry and possible photochemistry of a number of trace elements (including aluminium, copper, nickel, zinc, titanium, platinum and chromium) in oceanic waters. This part of the North Atlantic was selected for this study as it can be reached comparatively easily from the UK, and as it provides waters of varied origin. Possible photochemical effects and effects related to biological activity can be compared in the cold waters from the North with the warmer waters further south. Chromium was added later to the list of elements studies as this element is particularly interesting for photochemical aspects of this study because of its occurrence in two oxidation states.
Chief scientistC M G Van den Berg (University of Liverpool Department of Earth Sciences)
Cruise reportRRS Challenger CH76 cruise report ch76_90.pdf — access key 'C' (0.61 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Specificalong 20degW between 53degN and 30degN
Track chartsRRS Challenger CH76 cruise track — trk3695.html
Physical oceanography 
Water bottle stationsQuantity: number of stations = 13
CTD stationsQuantity: number of stations = 19
Transparency (eg transmissometer)Quantity: activity duration in days = 27
Description: continuous measurement from non-toxic supply
Chemical oceanography 
OxygenQuantity: number of stations = 13
OxygenQuantity: number of stations = 19
NitriteQuantity: number of stations = 13
AmmoniaQuantity: number of stations = 13
SilicateQuantity: number of stations = 13
Trace elementsQuantity: number of stations = 13
Other chemical oceanographic measurementsQuantity: number of stations = 13
Trace metalsQuantity: number of stations = 13
Description: Cu, Ni, Cr, Pt, Ti, Al, Fe and V by voltammetry
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 19
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: activity duration in days = 27
Description: continuous measurement from non-toxic supply